Chemical marker



A. E. SCHMIDT.

CHEMICAL MARKER.

APPLICATION FILED 0CT.-20. 1919.

"1,357,594, Patented Nov. 2, 1 20.

INVENTOR:

A TTORNEY.

- to provide a marking uni-ran STATES ALFRED E. SCHMIDT, 0F NEWARK,'NEWJERSEY.

CHEMICAL MARKER.

Specification of Letters Patent.

Patented Nov. 2, 192

Application filed October 29, 1919. Serial No. 331,850.

To all whom it may concern:

Be it known that I, ALFRED EDWARD SCHMIDT, a citizen of the UnitedStates,

and a resident of Newark, in the county of Essex and State of NewJersey, have invented new and useful Improvements in Chemical Markers,of whichthe following is a specification. 1 A

This invention relates in general to a marking device in the nature of apencil or crayon, and more particularly to a device of this characterfor marking upon hides, for identification purposes or the like, whilethe hides are wet from a tanning process.

The objects of theinvention are to provide a marking composition whichchemically acts upon a substance over which the device is drawn toproduce a visible inscription in the path of the marking device; toprovide a marking device which will produce an indelible and plainlyvisible inscription; to obtain a marking composition of the characterwhich will produce an inscription or mark which is water proof and willnot run or blur; to secure a device which is solid in formation so as tobe easily handled; to provide a novel composition of matter for such amarking device; to obtain a marking device comprising a solidcomposition of matter including a chemical which coacts with anotherchemical on the substance touched by themarking device, and a vehicle orbinder for carr ing said chemical; device comprising a solid compositionof matter including a chemical and binding ingredients, which is solublein another chemical, whereby the first-mentioned chemical is liberatedfrom the composition and coacts with said second mentioned chemical, thebinding ingredients then becoming inactive; and to obtain other objectsand results as may be brought out by the following description.

Referring to the accompanying drawing which illustrates one embodimentof my invention, and in which like numerals of ref erence indicate thesame parts throughout the several views,

Figure 1 is a perspectlve view of one form' of stick of my improvedmarking composition;

Fig. 2 is a similar view,

showing another form of Stick;

Fig. 3* is a perspective view, showing my invention in the form of apencil, and

Fig. 4: is a transverse sectional view through the pencil shown by Fig.3.

My composition herein described is particularly adapted for placingidentification marks on Wet hides which have been tanned with vegetabletannin matters. It is the present custom of tanners or leather workersto use a lump of iron sulfate or copperas for marking the hides, whichwhen drawn over a wet hide tanned with vegetable tannin matters producesa black, indelible mark on the hide. However, the lumps of copperas areunwieldy and hard to handle, irregular in shape, and easily crumble.

My invention eliminates these difliculties by combining copperas withsuitable gelatinous or adhesive binding agents to prevent crumbling anda hardening agent, and molding the. composition into any desired formfor marking. In making my improved com position I use sulfate of iron(copperas), starch, glue, glucose, and plaster of Paris in the followingproportions: 1 pound sulfate iron, 1 ounce starch, 1 ounce glue, ounceglucose, ounce plaster of Paris, water.

The sulfate of iron is dissolved in one quart of water, to which isadded the starch dissolved in two ounces of water, the glue dissolved intwo ounces of water, the glucose dissolved in one ounce of water, andthe plaster of Paris. These ingredients are thoroughly mixed together,and the whole mass boiled while stirring, until the compound acquires aconsistency which will solidify when cooled. The compound is then pouredwhile'hot into any suitable mold and allowed to cool and solidify.

Obviously, the compound can be molded into many shapes suitable formarking, such as the flat rectangular stick 1 shown by Fig. 1, or thecylindrical stick 2 shown by Fig. 2. If desired the sticks 1 or 2 can becovered, as by gluing between two pieces of wood, or the like,-3 and 4,so that the compound can be handled without soiling the hands, and willbe protected from being acted upon by other chemicals. The markingdevice is thus in the form of a pencil 5,

- which can be sharpened in the conventional manner, as at 6, to exposethe compound for marking. The marking device is used similarly to aconventional pencil or crayon, and when drawn over a wet hide which hasbeen tanned with vegetable tannin matters, the compoundslightlydissolves and liberates the copperas, which chemically 'coacts with thechemicals used in the tanning process to produce an indelible, clear,and unblurrable black mark, the binding and hardening agents passing offinactive.

Other chemicals than copperas or the sulfate of iron can be utilized,and for marking on wet hides any iron salt is equally well adapted asthe sulfate of iron. F urthermore, I could use other binding agents thanthe starch, glue and glucose, for instance, casein, gum, or sugar; and,as a hardening agent, I could use chalk, or a carbonate of lime, insteadof the plaster of Paris. However, the plaster of Paris is preferable inmy present compound,- as it is firmer.

Having thus described the invention,

what I claim is:

1. A marking composition comprising a substance chemically coactive withthe surface of a tanned hide, and binding and hardening agents.

2. A marking composition comprising ,a

substance chemically coactive with the wet surface of a hidedn theprocess of tanning, 3

and binding andfjhardening agents.

3. A markingcomposition comprising a substance chemically coactive withthe surface of a wet hide tanned in Vegetable tannin matter, and bindingand. hardening agents.

4. A marking composition comprising an iron salt, and binding andhardening agents.

5. A marking composition comprising an iron salt, a gelatinoussubstance, and a hardening agent.

6. A marking composition comprising an iron salt, a binding agent, andplaster of Paris for hardening.

' 7. A marking composition comprising an iron salt, starch, glue,glucose, and a hardening agent.

8. A marking composition comprising an iron salt, starch, glue, glucose,and plaster of Paris.

9. A marking composition comprising one pound of an iron salt, one ounceof starch, one ounce of glue, one-half ounce of glucose, and one-halfpound of plaster of Paris.

ALFRED E. SCHMIDT.

